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  /*
   * @(#)ImageInputStreamAdapter.java  1.0  2009-12-17
   * 
   * Copyright (c) 2009 Werner Randelshofer, Goldau, Switzerland.
   * All rights reserved.
   *
   * You may not use, copy or modify this file, except in compliance with the
   * license agreement you entered into with Werner Randelshofer.
   * For details see accompanying license terms.
  */
 
 package org.monte.media.io;
 
ImageInputStreamAdapter.

Author(s):
Werner Randelshofer
Version:
1.0 2009-12-17 Created.
 
 public class ImageInputStreamAdapter extends FilterInputStream {
     private ImageInputStream iis;
     public ImageInputStreamAdapter(ImageInputStream iis) {
         super(null);
         this.=iis;
     }

    
Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

This method simply performs in.read() and returns the result.

Returns:
the next byte of data, or -1 if the end of the stream is reached.
Throws:
java.io.IOException if an I/O error occurs.
See also:
java.io.FilterInputStream.in
 
     @Override
     public int read() throws IOException {
 	return .read();
     }

    
Reads up to len bytes of data from this input stream into an array of bytes. If len is not zero, the method blocks until some input is available; otherwise, no bytes are read and 0 is returned.

This method simply performs in.read(b, off, len) and returns the result.

Parameters:
b the buffer into which the data is read.
off the start offset in the destination array b
len the maximum number of bytes read.
Returns:
the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
Throws:
java.lang.NullPointerException If b is null.
java.lang.IndexOutOfBoundsException If off is negative, len is negative, or len is greater than b.length - off
java.io.IOException if an I/O error occurs.
See also:
java.io.FilterInputStream.in
 
     @Override
     public int read(byte b[], int offint lenthrows IOException {
 	return .read(bofflen);
     }

    

This method simply performs in.skip(n).

 
     @Override
     public long skip(long nthrows IOException {
 	return .skipBytes(n);
     }

    
Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream. The next caller might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.

This method returns the result of in.available().

Returns:
an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking.
Throws:
java.io.IOException if an I/O error occurs.
    @Override
    public int available() throws IOException {
	return  (.isCached()) ? //
            (int)Math.min(..length() - .getStreamPosition()) :
            0;
    }

    
Closes this input stream and releases any system resources associated with the stream. This method simply performs in.close().

Throws:
java.io.IOException if an I/O error occurs.
See also:
java.io.FilterInputStream.in
    @Override
    public void close() throws IOException {
    }

    
Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes.

The readlimit argument tells this input stream to allow that many bytes to be read before the mark position gets invalidated.

This method simply performs in.mark(readlimit).

Parameters:
readlimit the maximum limit of bytes that can be read before the mark position becomes invalid.
See also:
java.io.FilterInputStream.in
java.io.FilterInputStream.reset()
    @Override
    public synchronized void mark(int readlimit) {
    }

    
Repositions this stream to the position at the time the mark method was last called on this input stream.

This method simply performs in.reset().

Stream marks are intended to be used in situations where you need to read ahead a little to see what's in the stream. Often this is most easily done by invoking some general parser. If the stream is of the type handled by the parse, it just chugs along happily. If the stream is not of that type, the parser should toss an exception when it fails. If this happens within readlimit bytes, it allows the outer code to reset the stream and try another parser.

Throws:
java.io.IOException if the stream has not been marked or if the mark has been invalidated.
See also:
java.io.FilterInputStream.in
java.io.FilterInputStream.mark(int)
    @Override
    public synchronized void reset() throws IOException {
    }

    
Tests if this input stream supports the mark and reset methods. This method simply performs in.markSupported().

Returns:
true if this stream type supports the mark and reset method; false otherwise.
See also:
java.io.FilterInputStream.in
java.io.InputStream.mark(int)
java.io.InputStream.reset()
    @Override
    public boolean markSupported() {
	return true;
    }
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